diff --git a/photon.md b/photon.md
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+++ b/photon.md
@@ -1 +1,2 @@
-- "We are reminded of the process in which a molecule loses or gains a whole atom or a whole electron but never a fraction of one or the other" -- [[gilbert Lewis]] in [[The Conservation of Photons]].
+- "We are reminded of the process in which a molecule loses or gains a whole atom or a whole electron but never a fraction of one or the other" -- [[Gilbert Lewis]] in [[The Conservation of Photons]].
+  - "[[Einstein]] was led to the idea of light quanta which has proved so fertile"